<template>
  <div v-if="!disabled" class="upload-file">
    <el-upload
      ref="uploadRef"
      v-model:file-list="fileList"
      :action="uploadUrl"
      :auto-upload="autoUpload"
      :before-upload="beforeUpload"
      :disabled="disabled"
      :drag="drag"
      :http-request="httpRequest"
      :limit="props.limit"
      :multiple="props.limit > 1"
      :on-error="excelUploadError"
      :on-exceed="handleExceed"
      :on-preview="handlePreview"
      :on-remove="handleRemove"
      :on-success="handleFileSuccess"
      :show-file-list="false"
      class="upload-file-uploader"
      name="file"
    >
      <el-button type="primary">
        <Icon icon="ep:upload-filled" />
        {{ title }}
      </el-button>
      <!-- <template v-if="isShowTip" #tip>
        <div style="font-size: 8px">
          大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
        </div>
        <div style="font-size: 8px">
          格式为 <b style="color: #f56c6c">{{ fileType.join('/') }}</b> 的文件
        </div>
      </template>
      <template #file="row">
        <div class="flex items-center">
          <span>{{ row.file.name }}</span>
          <div class="ml-10px">
            <el-link
              :href="row.file.url"
              :underline="false"
              download
              target="_blank"
              type="primary"
            >
              下载
            </el-link>
          </div>
          <div class="ml-10px">
            <el-button link type="danger" @click="handleRemoveFile(row.file)"> 删除</el-button>
          </div>
        </div>
      </template> -->
    </el-upload>
  </div>

  <!-- 上传操作禁用时 -->
  <!-- <div v-if="disabled" class="upload-file">
    <div v-for="(file, index) in fileList" :key="file.uid || index" class="flex items-center file-list-item">
      <span>{{ file.name }}</span>
      <div class="ml-10px">
        <el-link :href="file.url" :underline="false" download target="_blank" type="primary">
          下载
        </el-link>
      </div>
    </div>
  </div> -->
</template>
<script lang="ts" setup>
import { propTypes } from '@/utils/propTypes'
import type { UploadInstance, UploadProps, UploadRawFile, UploadUserFile } from 'element-plus'
import { isString } from '@/utils/is'
import { useUpload } from '@/components/UploadFile/src/useUploadV2'
import { UploadFile } from 'element-plus/es/components/upload/src/upload'
import { ElMessage } from 'element-plus'

defineOptions({ name: 'UploadFileV2' })

const message = useMessage() // 消息弹窗
const emit = defineEmits<{
  (e: 'file-uploaded', file: { data: any }): void
  (e: 'file-removed', file: UploadUserFile & { id?: number }): void
}>()

const props = defineProps({
  modelValue: propTypes.array.def([]), // 接收父组件传递的文件列表
  // fileType: propTypes.array.def(['doc', 'xls', 'ppt', 'txt', 'pdf']), // 文件类型
  fileType: propTypes.array.def(['pdf']), // 文件类型
  fileSize: propTypes.number.def(5), // 大小限制(MB)
  limit: propTypes.number.def(5), // 数量限制
  autoUpload: propTypes.bool.def(true), // 自动上传
  drag: propTypes.bool.def(false), // 拖拽上传
  isShowTip: propTypes.bool.def(true), // 是否显示提示
  disabled: propTypes.bool.def(false), // 是否禁用上传组件
  directory: propTypes.string.def(undefined), // 上传目录
  title: propTypes.string.def('选取文件')
})

// ========== 上传相关 ==========
const uploadRef = ref<UploadInstance>()
const fileList = ref<UploadUserFile[]>([])

const { uploadUrl, httpRequest } = useUpload(props.directory)

// 监听父组件传入的列表变化，完全同步父组件数据
watch(
  () => props.modelValue,
  (newVal) => {
    fileList.value = (newVal || []).map((item: any) => ({
      ...item,
      uid: item.uid || item.id || Date.now(), // 用id作为唯一标识
      status: 'success' // 标记为“已上传”状态
    })) as UploadUserFile[]
  },
  { immediate: true, deep: true }
)

// 文件上传之前判断
const beforeUpload: UploadProps['beforeUpload'] = (file: UploadRawFile) => {
  if (fileList.value.length >= props.limit) {
    message.error(`上传文件数量不能超过${props.limit}个!`)
    return false
  }
  let fileExtension = ''
  if (file.name.lastIndexOf('.') > -1) {
    fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
  }
  const isFile = props.fileType.some((type: string) => {
    return !!(fileExtension && fileExtension.toLowerCase() === type.toLowerCase())
  })
  const isLimit = file.size < props.fileSize * 1024 * 1024
  if (!isFile) {
    message.error(`文件格式不正确, 请上传${props.fileType.join('/')}格式!`)
    return false
  }
  if (!isLimit) {
    message.error(`上传文件大小不能超过${props.fileSize}MB!`)
    return false
  }
  message.success('正在上传文件，请稍候...')
  return true
}

// 文件上传成功：通知父组件，由父组件处理
const handleFileSuccess: UploadProps['onSuccess'] = (res: any): void => {
  message.success('上传成功')
  // 通知父组件上传成功，由父组件处理后续并重新获取列表
  emit('file-uploaded', {
    data: res.data
  })
}

// 处理文件删除：通知父组件
const handleRemoveFile = (file: UploadUserFile & { id?: number }) => {
  // 通知父组件删除，由父组件处理并重新获取列表
  emit('file-removed', file)
}

// 处理组件自带的删除事件
const handleRemove: UploadProps['onRemove'] = (file) => {
  handleRemoveFile(file as UploadUserFile & { id?: number })
}

// 文件数超出提示
const handleExceed: UploadProps['onExceed'] = (): void => {
  message.error(`上传文件数量不能超过${props.limit}个!`)
}

// 上传错误提示
const excelUploadError: UploadProps['onError'] = (): void => {
  message.error('文件上传失败，请您重新上传！')
}

// 预览文件
const handlePreview: UploadProps['onPreview'] = (uploadFile) => {
  if (uploadFile.url) {
    window.open(uploadFile.url, '_blank')
  }
}
</script>
<style lang="scss" scoped>
/* 保持原有样式不变 */
.upload-file-uploader {
  margin-bottom: 5px;
}

:deep(.upload-file-list .el-upload-list__item) {
  position: relative;
  margin-bottom: 10px;
  line-height: 2;
  border: 1px solid #e4e7ed;
}

:deep(.el-upload-list__item-file-name) {
  max-width: 250px;
}

:deep(.upload-file-list .ele-upload-list__item-content) {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}

:deep(.ele-upload-list__item-content-action .el-link) {
  margin-right: 10px;
}

.file-list-item {
  border: 1px dashed var(--el-border-color-darker);
  border-radius: 8px;
  padding: 8px 12px;
  margin-bottom: 8px;
}
</style>